<?php

namespace App\Http\Controllers\Public;

use App\Http\Controllers\Controller;
use App\Models\Certificate;
use App\Models\QuestionnaireResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\Storage;
use Illuminate\View\View;

class CertificateController extends Controller
{
    public function show(string $cert_token): View|RedirectResponse
    {
        $certificate = Certificate::where('token', $cert_token)
            ->with(['participant', 'program', 'template'])
            ->firstOrFail();

        $program     = $certificate->program;
        $participant = $certificate->participant;

        // Check questionnaire gate
        $pq = $program->questionnaire()->first();
        $needsQuestionnaire = $pq && $pq->is_confirmed;
        $hasAnswered = false;

        if ($needsQuestionnaire) {
            $hasAnswered = QuestionnaireResponse::where('program_id', $program->id)
                ->where('participant_id', $participant->id)
                ->exists();
        }

        // Find active QR code for questionnaire redirect
        $qrCode = $program->qrCode;

        return view('public.certificate.show', compact(
            'certificate', 'program', 'participant', 'pq',
            'needsQuestionnaire', 'hasAnswered', 'qrCode'
        ));
    }

    public function download(string $cert_token): Response|RedirectResponse
    {
        $certificate = Certificate::where('token', $cert_token)
            ->with(['participant', 'program'])
            ->firstOrFail();

        if (! $certificate->isGenerated()) {
            return back()->with('error', 'Sijil belum sedia untuk dimuat turun.');
        }

        if (! $certificate->file_path || ! Storage::disk('local')->exists($certificate->file_path)) {
            return back()->with('error', 'Fail sijil tidak dijumpai. Sila hubungi penganjur.');
        }

        // Check questionnaire gate
        $program = $certificate->program;
        $pq = $program->questionnaire()->first();

        if ($pq && $pq->is_confirmed) {
            $hasAnswered = QuestionnaireResponse::where('program_id', $program->id)
                ->where('participant_id', $certificate->participant_id)
                ->exists();

            if (! $hasAnswered) {
                $qrCode = $program->qrCode;
                $redirectTo = $qrCode
                    ? route('public.questionnaire.show', [$qrCode->token, $certificate->participant->uuid])
                    : back();
                return redirect($redirectTo)->with('info', 'Sila jawab borang penilaian terlebih dahulu.');
            }
        }

        $certificate->recordDownload();

        $content  = Storage::disk('local')->get($certificate->file_path);
        $filename = 'Sijil-' . str($certificate->participant->name)->slug() . '.jpg';

        return response($content, 200, [
            'Content-Type'        => 'image/jpeg',
            'Content-Disposition' => 'attachment; filename="' . $filename . '"',
            'Content-Length'      => strlen($content),
        ]);
    }
}